Vertical drilling and boring machine



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APPLICATION man MA1/20.1920.

VERTICALDRILLING AND BORING MACHINE.

UNITED s'mirzsl PATENT greise.

THOMAS LUMsDEN, or eA'rEsHEaD, nirerrrire.

VERTICAL DRILL-ING AND BORING MACHINE. 1

Specification of Letters Patent. Patented Apr. 1S, 1922.

Application filed May 20, 1920. Serial No. 382,720.

In a machine Y1n accordance with this invention the outer tool spindlelis provided with a detachable tool-receiving nose at one end, and witha ball or roller bearing where-v by the inner vspindle is supported.

I will fully describe my invention with reference` to the accompanyingdrawingr which is a part sectional elevation of a vertical drillingmachine embodying one construction in accordance with my invention.

Referring tothe drawings, the outer spindle 1 is made hollow and isprovided at its lower end with a detachable nose 2 adapted to receive adrill. Within the outer spindle is disposedV an inner spindle 3 alsoadapted at its lower end to receive a drill. The nose 2 may be connectedto the outer spindle 1 by a bayonet joint, by a thread, or by any otherdevice permitting it tobe readily attached thereto and detachedtherefrom. lThe outer spindle is `driven from the driving shaft l bybevel `wheels 5, 6, through a driving sleeve 7 integral `with the bevelwheel 6 provided with a key 8 engaging a long key-way 9 in theouterspindle. The bevel wheel 6 is supported by a bracket 21 on theframe 22 of the machine. The inner sp-indle 3 is driven through a beltpulley 10 keyed to a sleeve 23provided with a key 11 engaging a longkeyway 12in the upper portion of the inner spindle which projects beyondthe endy of the outer spindle. The sleeve 23 of the pulley 10 issupported by a ball bearing 24 carried by the head 25 of the frame 22 ofthe machine. The lower end of the inner spindle 3 is supported by a ballbearing 18 carried by the outer spindle 1, said ball bearing preventingendwise meve ment of the inner spindle in respect of the outer spindle.

The feed in the construction illustrated is Ycommon to bothSp-indles,and is operated by a pinion 14: on a shaft 15 carried by thebracket 21 and provided with a hand wheel 16, said pinion engaging arack 17 attached to a collar 18 bearing against ball thrust bea-rings19, 2O on the outer spindle 1. If desired, the feed shaft 15 maybe powerdriven. If desired, I may substitute roller bearings for the ballbearings 13, 19, 20, 24.

It will nowbe seen that the drilling machine herein .described has twoco-aXial toolV spindles either of which may be put into operationindependently of the other. The outerv spindle is intended for use withdrills of large diameter, while the inner spindle can be used for drillsof small diameter.

If desired, the tool spindles 1 and 3 may be adapted to receive a boringor similar tooly instead of a drill.

`What I claim as my invention, and desire to secure by Letters Patentis 1. In vertical drilling' and boring machines, the combination of ahollow outer spindle, a detachablev tool-receiving nose secured on saidspindle and forming extension thereof, a ball bearing carried spindle, atool-receiving spindle within said hollow outer spindle, said innerspindle being supported by said ball bearing, whereby relative endwisemovement of said spindles is prevented, bearings for said spindles,means for rotating said spindles, and means for feeding said spindles.

2. In vertical drillingk and boring malchinos` the combination of ahollow outer spindle` a detachable tool-receiving nose secured on saidspindle and yforming an eXtension thereof, a hall bearing carried byVsaid hollow outer spindle, a tool-receiving spinby said hollow outer ndle within said hollow outer spindle, said K inner spindle beingsupported by Said ball bearing, whereby relative endwise movement ofsaid spindle is prevented, bearings for said spindles, means forrotating said outer spindle, independent means for rotating said innerspindle, and means for simultaneously feeding both spindles.

In testimony whereof I have signed my name to ythis specification.

THOMAS LUMSDEN.

